Superfamily c.36.1: Thiamin diphosphate-binding fold (THDP-binding) [52518] (9 families) there are two different functional modules of this fold: pyridine-binding (Pyr) and pyrophosphate-binding (PP) modules
two Pyr and two PP modules assemble together in a conserved heterotetrameric core that binds two THDP coenzyme molecules